#include <stdio.h>
int main()
{char c;
int letters=0,space=0,digit=0,others=0;
printf("please input some characters\n");
while((c=getchar())!='\n')
{
if(c>='a'&&c<='z'||c>='A'&&c<='Z')
      letters++;
else if(c==' ')
      space++;
      else if(c>='0'&&c<='9')
       digit++;
        else
        others++;
}
printf("all in all:char=%d space=%d digit=%d others=%d\n",letters,space,digit,others);
}